class NoticeBoard extends AcGameObject{
    constructor(playground){
        super();
        this.playground = playground;
        this.ctx = this.playground.game_map.ctx;
        this.text = "已就绪：0人";
    }
        start(){

        }
        write(text){
            this.text=text;
        }
        update(){
            this.render();
        }
        render(){
            this.ctx.font = "20px serif";
            this.ctx.fillStyle = "white";
            this.ctx.textAlign = "center";
            this.ctx.fillText(this.text, this.playground.width/2, 20);
        }
}
